BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:Cosmological signatures of the late time symmetry breaking DTSTART:20251106T160000Z DTEND:20251106T180000Z DTSTAMP:20260921T015822Z UID:13bb4533-1efe-467c-853a-22d76df1be73 SEQUENCE:3 CREATED:20251028T093325Z DESCRIPTION: Our universe has already experienced a series of profound pha se transitions - from the Grand Unified and electroweak epochs to the QCD transition - and it may not be finished yet. The Higgs field could reside in a metastable state\, poised to decay into a true vacuum. Tiny black hol es or high-energy events could catalyze this transition\, creating expandi ng bubbles of true vacuum racing toward us at nearly the speed of light. I n this talk\, I will present quantitative predictions for the observable s ignals such a catastrophic event might generate. We estimate the Higgs par ticles emitted from a bubble wall\, track their decay products\, and deriv e the resulting photon and neutrino energy spectra - possible early-warnin g signatures that could precede the arrival of the bubble itself. I will t hen discuss two related scenarios: one involving a TeV-scale colored scala r that breaks SU(3)c and another involving a charged scalar that breaks U( 1)EM. In both cases\, the first-order phase transition produces distinctiv e photon and neutrino spectra that could serve as unmistakable fingerprint s of an impending vacuum collapse. LAST-MODIFIED:20251031T141341Z LOCATION:Sala P13\, IST\, Edifício de Matemática\, 2nd floor URL:http://df.vps.tecnico.ulisboa.pt/pt/eventos/a-model-of-quark-and-lepto n-compositeness-and-its-flavour-signatures/ X-ALT-DESC;FMTTYPE=text/html:

Our universe has a lready experienced a series of profound phase transitions - from the Grand Unified and electroweak epochs to the QCD transition - and it may not be finished yet. The Higgs field could reside in a metastable state\, poised to decay into a true vacuum. Tiny black holes or high-energy events could catalyze this transition\, creating expanding bubbles of true vacuum racin g toward us at nearly the speed of light.

In this talk\, I will present quantitative predictions for the observable signals such a catastr ophic event might generate. We estimate the Higgs particles emitted from a bubble wall\, track their decay products\, and derive the resulting photo n and neutrino energy spectra - possible early-warning signatures that cou ld precede the arrival of the bubble itself.

I will then discuss two related scenarios: one involving a TeV-scale colored scalar that brea ks SU(3)c and another involving a charged scalar that breaks U(1)EM. In bo th cases\, the first-order phase transition produces distinctive photon an d neutrino spectra that could serve as unmistakable fingerprints of an imp ending vacuum collapse.

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